What is an oil catch can?

An oil catch can is a device used to trap and collect oil vapors and other contaminants that are released from the engine's crankcase ventilation system. The catch can prevents the oil and contaminants from entering back into the engine's intake system, which can cause damage to the engine and reduce performance. The oil catch can typically consists of a container with a filter element that separates oil and other contaminants from the air passing through it. Once the oil and contaminants are captured in the catch can, they can be easily removed and disposed of, or the oil can be recycled. Oil catch cans are commonly used in performance vehicles, racing cars, and diesel engines to protect the engine and improve its overall performance.